Which of the following statements accurately describes the expression x-2/x^2+9?
2 answers:
The quotient of two numbers is the result of the division of the first listed number by the second listed number.
Also, the product of two numbers is the result of the multiplication of the first listed number and the second listed number.
But because, multiplication operation is comutative [the result is the same irrespective of which is listed first].
We can say that the product of two numbers is the result of the multiplication of the two numbers irrespective of which is listed first.
Given the expression
Here, x - 2 is being divided by
.
Therefore, the accurate descripton of the given experession is the quotient [becuase of division] of x - 2 [the numerator or the dividend] and [the denominator or the divisor]
(option A).
Also, the product of two numbers is the result of the multiplication of the first listed number and the second listed number.
But because, multiplication operation is comutative [the result is the same irrespective of which is listed first].
We can say that the product of two numbers is the result of the multiplication of the two numbers irrespective of which is listed first.
Given the expression
Here, x - 2 is being divided by
Therefore, the accurate descripton of the given experession is the quotient [becuase of division] of x - 2 [the numerator or the dividend] and
(option A).
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Answer:
a. The point estimate was of $44,600.
b. The sample size was of 16.
Step-by-step explanation:
Confidence interval concepts:
A confidence interval has two bounds, a lower bound and an upper bound.
A confidence interval is symmetric, which means that the point estimate used is the mid point between these two bounds, that is, the mean of the two bounds.
The margin of error is the difference between the two bounds, divided by 2.
a. What is the point estimate of the mean salary for all college graduates in this town?
Mean of the bounds, so:
(38737+50463)/2 = 44600.
The point estimate was of $44,600.
b. Determine the sample size used for the analysis.
First we need to find the margin of error, so:
Relating the margin of error with the sample size:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Z-table as such z has a p-value of .
That is z with a pvalue of , so Z = 1.64.
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
For this problem, we have that . So
The sample size was of 16.